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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Popocatepetl's crater filled to the brim: significance for hazard evaluation
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Popocatepetl's crater filled to the brim: significance for hazard evaluation

机译:Popocatepetl的火山口充满了边缘:对危害评估的意义

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摘要

After ~67 years of quiescence Popocatepetl volcano reawoke on December 24, 1994 emitting vigorous ash plumes. Juvenile magma appeared for the first time on March 29, 1996, with the emplacement of a dacitic lava dome inside the crater. Since then, more than 25 dacitic domes have been extruded and destroyed by subsequent explosions. On January 22, 2001 the activity peaked with a strong explosion that produced pyroclastic flows that reached the timberline and ignited fires at a distance of 4.5 km from the crater. These pyroclastic flows were contained within the red zone of the volcano hazards map. After 10 years of discontinuous activity Popocatepetl's crater is almost completely filled with lava dome rock. This scenario poses a new threat to the populations settled in the orange zone (intermediate hazard level) because future explosions will not be contained by the crater walls and pyroclastic flows will probably reach greater distances from the crater.
机译:经过约67年的静止期,波波卡特佩特火山于1994年12月24日重新唤醒,散发出浓烈的灰羽。少年岩浆于1996年3月29日首次出现,当时在火山口内放置了一个高耸的熔岩圆顶。从那时起,超过25个大圆顶被后来的爆炸挤压和破坏。 2001年1月22日,该活动以强烈爆炸达到顶峰,产生了火山碎屑流到达林线并点燃了距火山口4.5公里的火。这些火山碎屑流包含在火山灾害图的红色区域内。经过10年的不连续活动,波波卡特佩特的火山口几乎完全被熔岩圆顶岩石充满。这种情况对定居在橙色区域(中等危害水平)的居民构成了新的威胁,因为火山口的围墙将不会遏制未来的爆炸,火山碎屑流可能会距离火山口更远。

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